Differs from Macropneustes in having aligned primary aboral interambulacral tubercles. Originally distinguished because of its supposed lack of subanal fasciole. Yet the type specimen shows traces of a subanal fasciole on plate 4 beneath the periproct. Fourtau (1904, p. 609) also stated that although the first specimen showed no trace of a subanal fasciole, other specimens do and that it is definitely present. Fourtaunia seems not to differ in any significant way.

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